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Finding the Fourth Proportional to 555.39, 830.03 and 511.61

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Solution

The fourth proportional to 555.39, 830.03 and 511.61 is: 764.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.39 : 830.03 = 511.61 : x
  2. Step 2: Convert to fraction form
    555.39/830.03 = 511.61/x
  3. Step 3: Cross multiply
    555.39x = 830.03 × 511.61
  4. Step 4: Simplify right side
    555.39x = 424,648.78
  5. Step 5: Solve for x
    x = 424,648.78/555.39
  6. Step 6: Final answer
    x = 764.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.